1906.] NERVES OF CHLAMYDOSBLACUUS ANGUINEUS. 989 



21. Some of the lateral line canals, sucli as the main lateral 

 canal and parts of the hyomanclibular, vary greatly in individuals. 

 and on the two sides of the same individual. There are traces of 

 canals which may be incipient or degenerate. The canal-system 

 is in an unstable condition. 



22. The lower jaw has been swung back into a reptilian-like 

 position with the results, (a) that to it may be due the absence of 

 the typical maxillo-mandibular trunk ; (b) that possibly the push- 

 back of the branches of the vagus may have resulted in their 

 unexpected union with one another and with the r. lateralis vagi ; 

 (c) the great development of a hypoglossal musculature and the 

 presence of a hypoglossal nerve. 



23. The internal rectus muscle consists of two well-defined 

 parts. 



24. The pectoral plexus consists of vei'y few nerves, and thus 

 the pectoral girdle may be regarded as specialised, again 

 suggesting a relationship between Chlamydoselachus and the 

 Teleosts. 



K. Bibliography. 



1. Allis, E. P., Jr. — The Lateral Sensory Canals, the Eye- 



Muscles, and the Peripheral Distribution of certain of the 

 Cranial Nerves of Mastelus Icevis. Q. J. M. S. n. s. vol. xlv. 

 pp. 87-236. Nov. 1901. 



2. CoGGi, A. — Nuove ricerche sullo sviluppo delle ampolle di 



Lorenzini. Kend. Accad. Lincei, pp. 289-297. 1902. 



3. Cole, F. J. — On the Cranial Nerves of Chimcera monstrosa 



(Linn.), with a discussion of the Lateral Line System and 

 of the Morphology of the Chorda Tympani. Trans. Roy. 

 Soc. Edin. xxxviii. Part iii. no. 19, pp. 631-680. 1896. 



4. Cole, F. J., & Dakin, W. J. — Farther Observations on the 



Cranial Nerves of Ghimoira. Anat. Anz. vol. xxvii. p. 595. 

 1906. 



5. CoLLiNGE, W. E. — On the Sensory and Ampullary Canals of 



Chimcera. Proc. Zool. Soc. London, pp. 878-890. Dec. 1895. 



6. EwART, J. C, & Cole, F. J. — On the Dorsal Branches of the 



Cranial and Spinal Nerves of Elasmobranchs. Proc. Roy. 

 Soc. Edin. pp. 475-480. 1895. 



7. Garman, S. — Chlamydoselachus auguineus — a living Species of 



Oladodont Shark. Bull. Mus. Conip. Zool. vol. xii. no. 1 . p. 1 .. 

 1885. 



8. Garman, S. — Chlamydoselachus anguineus. Bull. Essex 



Institute, vol. xvi. Jan. 17, 1884. 



9. Garman, S. — Chlamydoselachi(,s anguineus. Science, Feb. 1, 



p. 116 ; March 21, p. 345 ; Nov. 28, p. 484. 1884. _ 



10. Garman, S. — On the Lateral Canal System of Selachia and 



Holocephala. Bull. Mus. Comp. Zool. vol. xvii. no. 2. 1888. 



11. Goodrich, E. S. — Notes on the Development, Structure, and 



Origin of the Median and Paired Fins of Fishes. Q. J. M. S. 

 n. s., no. 198, pp. 333-376. June 1906. 



